is 2 2047651 - 1
has 616405 decimal digits
takes 0.135 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1D5320BF4CFC5A51double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual270116.695070.0000%1540000047011244280245.576415.2203%362.271474.5661%
Target2620.300066.1290%90006000000.00391.3300%0.304066.5795%
Difference+8+116.3950+3.8710%+15391000+47010644280+245.5724+13.8903%+361.9674+7.9866%

Known prime factors:
No known factors for M2047651

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28Jocelyn Larouchev4_computers10001000---9.53375e-5--0.003%
2002-05-05Jocelyn Larouchev4_computers20002000---0.000--0.010%
2003-01-16ANONYMOUSv4_computers25000425000---0.004--0.810%
2010-12-28Jocelyn LaroucheManual testing3000030000---0.003--0.250%
2011-01-04Jocelyn LaroucheManual testing5000050000---0.005--0.371%
2012-01-05Squeeky_SquirrelP4_26001350002868750---0.027--2.144%
2014-10-22Jocelyn LaroucheManual testing166345166345---0.016--0.806%
2015-10-06Bruno Victal4790K-windows5000001500000012---0.123--3.828%
2019-07-01BigBrotherWinston10000002000000012---0.194--4.413%
2019-08-05mikrMSI400000020000000012---1.399--7.476%
2023-01-27Jocelyn LaroucheManual testing1000000710870160---3.783--7.661%
2023-03-10Jocelyn LaroucheManual testing10000002049006960---10.73--8.683%
2023-07-05JossJoss10000004437761790---23.14--9.441%
2023-08-26Sid & AndySpeck1540000047011244280---245.6--15.220%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10ANONYMOUSv4_computers21258--0.019--
2016-02-23Mark RoseManual testing258260--0.056--
2009-01-03Sturle Sundegonzo.ifi260261--0.075--
2012-02-28Sebastian HornbostelManual testing261262--0.150--
2013-08-30ramgeisManual testing262263--0.479--
2015-04-13VictordeHollanderManual testing263264--0.959--
2015-04-13VictordeHollanderManual testing264265--1.825--
2015-11-02ramgeisManual testing265266--3.649--
2016-08-04Gordon SpenceManual testing266267--7.299--
2019-03-23chuenkitManual testing267268--14.60--
2021-08-16TJAOIManual testing268269--29.20--
2023-01-24Architects CubedGPU72_TF269270--58.39--


ECM factoring results:
Total ECM effort:17.303 GHz-days
Estimated T-Level:23.599
DigitsB1CompleteFacMiss
20110007.7820.042%
25500000.72048.685%
302500000.04595.555%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000017214.59
500006750000282.713


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-01-01Richard Larson1D5320BF4CFC5A510.135
1999-03-15ANONYMOUSv4_computers1D5320BF4CFC5A510.135
2016-07-15Mark Rosemichelangelo1D5320BF4CFC5A510.135


PRP results:
No PRP results for M2047651


P-1 factor-bounds graph:
B1 = 15400000, B2 = 47011244280 (P-1 stage 2)
B1 = 1000000, B2 = 4437761790 (P-1 stage 2)
B1 = 1000000, B2 = 2049006960 (P-1 stage 2)
B1 = 1000000, B2 = 710870160 (P-1 stage 2)
B1 = 15400000 (P-1 stage 1)
B1 = 4000000, B2 = 200000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 135000, B2 = 2868750 (P-1 stage 2)
B1 = 166345 (P-1 stage 1)
B1 = 135000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 25000, B2 = 425000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 25000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
B1 = 1000 (P-1 stage 1)
102
103
104
105
106
107
108
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
270
269
268
267
266
265
264
263
262
261
260
258
this exponent TF target: 62
TF double-checked to: 67.9
ECM T-Level=23.6 ~= 62-bit
250
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270
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Last modified: 2023-10-02T12:12:48+00:00